Earthquake Damages and Characteristics of Highway Tunnels in the 8.0-Magnitude Wenchuan Earthquake
(1 School of Civil Engineering, North China University of Technology, Beijing 100144; 2 Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu 610031; 3 Sichuan Provincial Transportation Department Highway Planning, Survey, Design and Research Institute, Chengdu 610041)
Abstract：
It is important to understand the characteristics of earthquake damage to tunnels in order to provide a reference for the aseismic design of tunnels in areas of high-intensity earthquakes. Based on the investigation and analysis of earthquake damage on highway tunnels after the Wenchuan earthquake, the characteristics of earthquake damage to various tunnel structures were studied and summarized. The characteristics of earthquake damage at the tunnel portals are as follows: the structure outside of the tunnel portal is seriously affected by a secondary geological hazard, there is little earthquake damage of the support structure at the tunnel portal in hard rock, slight damage in the form of cracking and water seepage occurs in the secondary lining at a tunnel portal in soft rock with an 8.0-intensity earthquake, and serious earthquake damage such as collapse of the secondary lining occurs in areas with an 11.0- intensity earthquake. Earthquake damage is slight for tunnels passing through inactive faults, while serious earthquake damage (collapse of the secondary lining and rock mass) occurs for tunnels passing through active faults.As for tunnel structures in ordinary sections, there is little earthquake damage in hard rock tunnels, cracking and water seepage occur in the lining of ordinary sections with alternating soft rock and hard rock in an 8.0-intensity earthquake and the soft section in a 9.0~intensity earthquake, staged lining occurs at an ordinary section with alternating soft rock and hard rock in earthquakes of 10.0~11.0 intensity, and the serious damage of collapse of the secondary lining occurs at the ordinary section with defects of the surrounding rocks.
CUI Guang-Yao- 1 Wu-Xiu-Gang- 1 Wang-Ming-Nian- 2 Lin-Guo-Jin- 3
.Earthquake Damages and Characteristics of Highway Tunnels in the 8.0-Magnitude Wenchuan Earthquake[J] MODERN TUNNELLING TECHNOLOGY, 2017,V54(2): 9-16
2017, Vol. 54 